Thread-clamp for wax-thread sewing-machines.



No. 775,363. I PATENTED NOV. 22, 1904. H. A. DODGE.

THREAD CLAMP FOR. WAX THREAD SEWING MACHINES.

APPLICATION FILED JUNE 8, 1904.

N0 MODEL.

Zgzmessas j/wamr No. 775,363. Patented November 22, 1904.

UNITED STATES PATENT OFFICE.

HENRY A. DODGE, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO CAB [P- BELL-BOSW'ORTH MACHINERY COMPANY, OF PORTLAND, MAINE, A CORPORATION OF MAINE.

THREAD-CLAMP FOR WAX-THREAD SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 775,363, dated November 22, 1904.

Application filed June 8,1904. Serial No. 211,596. No modeld l thereby greatly to increase the life of the To (all /10/12 if 'nm concern:

Be it knownthatLHmmY A. DODGE,aCll1l l parts and the efficiency of the devices as zen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and use- I ful Improvements in Thread-Clam ps for W'axthread-clamps.

To the above end the present invention consists of the thread-clamp hereinafter described and claimed.

Thread Sewing-Machines; and I do hereby dei In the accompanying drawings, Figure 1 is clare the followingto bea full, clear, and exact a side elevation of a portion of the sewingdescription of the invention,such as will enable machine illustrated in Letters Patent to Camp- IO others skilled in the art to which it appertains bell, No. 374,936, illustrating the threadto make and use the same. clamps of the present invention as applied to The present invention relates to an imthat machine; and Fig. Qis a section taken on provement in thread-clamps for wax-thread the line X X, Fig. 1, and looking in the diseWing-machines. In wax-thread sewing-marection of the arrows that is to say, it is a 5 chinesas ordinarily constructed thread-clamps horizontal section shown in bottom plan are employed to clamp the thread at two The present invention is not limited in its places, the one to prevent the pulling off of application to sewing-machines of the type 5 thread from the supply during the operation illustrated in the said patent, as it may be of the take-up and the other to prevent the employed in other forms of sewing-machines.

2O pulling back of thread from the needle during The take-up standard 1 corresponds to the the operation of the pull-off. These threadstandard 7) of the said patent. The take-up clamps commonly consist of a pivoted lever and pull-off lever 2, the auxiliary take-up 7 provided with an eye at one end and at its optruck 3, and actuating mechanism for these posite end a curved face which cooperates parts are illustrated herein merely for the 5 with a concaved faced thread block. The purpose of showing the general operative repull upon the lever exerted by the thread lation in which the thread-clamps of the pres causes the shorter end of the lever to press ent invention are employed. The lead of the thethread with force against the thread-block, thread extends from the eye I through the and thereby to clamp and hold the same beeye 5 of the lever 2, thence through the eye 3 tween the parts. In sewingmachines the 6 of the lever T of the pull-off thread-clamp, thread under the influence of the thread- (indicated in a general way by the reference guides and the position of the thread-eye in characterS.) The thread then passes between the thread-clamping lever tends to run conthe smooth face of the clamping end 9 of the stantly over a certain portion of the surfaces lever 7 and the smooth concave face of the 5 5 of the end of the lever and the thread-block. thread-block IO and then between two of the This causes an excessive wear to occur upon depending fingers 11, secured to or formed the particular portions of the thread-block integralwith said thread-block 10. Thus the 5 and the end of the lever which are engaged thread passes along through the thread-clamp, by the thread, and in a very short time the (indicated in a general way by the reference 4 wear is so considerable that the etliciency of character 12, beingthe take-up thread-clamp) the device is impaired and the renewal of the and over the take-up trucks or pins. The two parts is necessitated. These parts being thread-clamps 8 and 12 are identical in con- 9 made of hardened steel are expensive to make struction. The wearing-sni-faces of the threadand to renew; and the object of the present blocks and the clamping-levers are made con- 45 invention is to reorganize andimprove threadsiderably wider than would be necessary in clamps for wax-thread sewing-machines in case the thread passed between them in one order to distribute the car over the surfaces y position only. In order that several separate normally -intended to engage the thread,

positions may be provided for the thread and indicated in dotted lines.

in order that the thread may occupy these positions alternatively, guiding means are provided for guiding the thread to either position at will. These guiding means in the illustrated embodiment of the invention comprise a series of projections between which the thread passes. The thread-block 10 is provided with four downwardly-extended fingers 11. (Shown in section in Fig. 2.) By laying the thread between two of these fingers its line of passage over the thread-block 10 is determined. Thus, as indicated in Fig. 2, the thread may pass through the thread-clamps along the line indicating the thread in full lines, or it may pass along either of the lines The line of passage oi the threadover the thread-blocks is thus determined by the doWnwardly-extending fingers projecting from the thread-blocks, and in use While it may he often desirable to lay the thread every time in a certain one of the passages it is considered that the preferred mode of use will be to lay the thread in Whatever passage between two fingers 11 it happens to fall in, where it will remain until the machine is again threaded, when the thread may fall either in the same or a different passage.

Having thus described the invention, what is claimed is A thread-clamp for wax-thread sewing-machines, having, in combination, a smooth-faced clamping member and a smooth-faced threadblock, having thread-engaging clamping-surfaces of Width sufficient to aflord several separate positions for the passage of the thread herebetween, and means independent of the clamping-surfaces for guiding the thread in either of such positions to distribute the wear over the wearing-surfaces, substantially as described.

, In testimony whereof I affix my signature in presence of two witnesses.

HENRY A. DODGE.

\Vitnesses:

HORACE VAN EVEREN, FARNUM F. DORSEY. 

